Bed-motion for cylinder printing-machines.



Patented Dec. I8, |900.

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BED MOTION FDR CYLINDER PBINTINGMA'GHINES.

(Application mea un. 17, 1894.) I l 3 Sheets-Sheet l.

(Alle Model.)

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No. 664,IOU. Patnt'ed Dec. I8, |900. W. SCOTT.

BD MOTION FUR CYLINDER PRINTING MACHINES.

(Applicatin Bled Jan. 17, 1894.) (No Model.) 3 Sheets-Sheet 2,

'Ma/KW', I *@M/ No. 664,I00. Patented Dec. I8, I900.

, w. scoTT.- BED MDTION FOR CYLINDER PRINTING MACHINES. (Application ledJan. 17, 1894,] (No Model.) 3 Sheets-Sheet 3.

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UNITED STATES Fries.

EARN

WALTER SCOTT, OF PLAINFIELD, NEW JERSEY.

SPECIFICATION forming part of Letters Patent No. 664,100, dated December18, 1900.

`Application filed January 17, 1894. Serial No. 497,153. (No model.)

1'0 LZZ whom t may concern:

Be it known that I, WALTER SCOTT, a citi- Zen of the United States, anda resident of Plainfield, in the county of Union and State of NewJersey, have invented certain new and useful Improvements in Bed-Motionsfor Oylinder Printing-Machines, of which the following is aspecification.

This invention relates primarily to the means for giving a reciprocatingmotion to the beds of cylinder printing-machines. There are severalclasses of such machines, and the invention is applicable to all ofthem. One such class includes continuously-revolving cylinders which arelifted during the return or non-printing stroke of the bed or which havea depressed part which is opposite the bed during such return stroke.Another class of these machines includes a cylinder which is at restduring the return stroke of the bed and which is driven in unison withthe bed during the forward or printing stroke inder is an oscillatingone, being usuallydriven by a rack on the bed. Such cylinder may takeimpressions in a variety of Ways, as during one stroke of the bed andnot during the other, being raised from the impressing position duringthev return stroke, or it may take impressions during both strokes.Again, there is a class wherein there are two or moreimpression-cylinders for one bed, which coact therewith in ways wellknown to makers and users of machines of this class. In all theseclasses the aim is to secure an eX- act equality of speed of theprinting and the impression-surfaces, coupled with a quick reversal ofthe motion of the bed and smoothness of motion of all parts. The objectof this invention is to secure all these ends.

This invention is an improvement upon a movement heretofore patented,which patented movement consists generally of a reciprocating bed, arack thereon, a rack-driving pinion on a shaft carrying a second pinion,a pivoted frame carrying said shaft, and a driving-gear with which saidsecond pinion meshes. Certain defects are inherent in this construction,and it is the object of this invention to overcome or avoid these. Thesedefects are the unequal speeds at which the rack-driving pinion passesthe ends of the rack and the variations of the power required at thesame places. These defects appear to be due to a lack of flexibility inthe mechanism of the movement, as at one end of' the rack the secondpinion revolves about the driver-gear in the direction of its oWnrotation, taken at the point where the two mesh, while at the other endof t-he rack the contrary is the ease, so that it may be said that vthecontrivance works with itself at one end and against itself at the otherend of the movement of the reciprocating bed. According to the presentinvention the proper flexibility is secured in a mechanism of thisnature by introducing suitable gearing between the driving-gear and thesecond pinion. An auxiliary device may be used to regulate the speed ofthe frame when the driving-pinion passes the ends of the rack in eithercase; but it does not Wholly remedy the defects named as inherent in thefirst or prior construction.

The preferred form of this invention is shown in the accompanyingdrawings, forming part of this specification, wherein- Figure l is avertical longitudinal sectional view on the plane indicated by the linel l in Fig. 2 of a machine embodying the invention. Figs. 12L and 1b areviews showing other portions of the rack-driving mechanism than thatshown in Fig. 1. Fig. 2 is a horizontal longitudinal sectional view onthe plane indicated in Fig. 1 by the line 2 2, and Fig. 3 is across-sectional view on the plane indicated by line 3 3 in Fig. 2.

The reference A marks a suitable framework in which are mounted thevarious elements of the machine. A reciprocating member T (as thetype-bed of a printing-press) is provided with a rack 2, with which therackdriving pinion 3 coacts to drive the said member. The pinion 3 iscarried in a suitable movable frame F, (shown as pivoted on the axis 4,which is journaled in frame A,) so that it may pass around the ends ofthe rack 2 and engage either side thereof. A second pinion 5 is rigidwith the pinion 3, so as to move therewith. This rigidity may be securedin any suitable way, as by that shown, wherein pinions 3 5 are fast on ashaft 6, which is jonrnaled in the frame F. The said frame F isjournaled on the axis or shaft 4, which cai'- ries the maindriving-piniou 7 and carries a pinion 8 on a stud or shaft 9, the saidpinion 8 being in mesh with pinions 5 7. The shaft 4 is driven in anysuitable way, as by a belt for the fast and loose pulleys 10 11. If sodesired, a weight 12 maybe used to counterbalance the weight of frameFand the parts carried thereby. As the end teeth of rack 2 are subjectto greater wear than the others I prefer to have them in the form of aloose ferrule 13, held on a pin or stud 14, as in Letters Patent grantedto Charles F. Owen, dated the 1st day of May, 1383, and numbered276,621. In addition to this rotative feature these teeth are preferablymade larger .than the other teeth of the rack, and the teeth of thepinion 3, between which they enter, are correspondinglyseparated, as atl5. Certain of the teeth of the rack intermediate the ends are madelarge, as at 16, to fit the kerfs 15. At each end of the rack is acurved or circular guide 17 to receive and guide one or the other ofpins 18 on the said face of pinion 3. By using that pin 1S nearest theend of the rack as pinion 3 turns the end the size of the guide thereforis greatly reduced and greater steadiness of the reciprocating member Tobtained. The stops 19 limit the motion of the frame F in bothdirections. It is well known that the number of pins 18 on the pinion 3depends on the number of turns of that pinion to a completereciprocation of the bed. Thus where the number of turns is odd there isbut one such pin 18 required, while if said number be even two arerequired. In the instance shown in the drawings the number of such turnsis four; but this invention is in no wise limited to either odd or eventurns of said pinion 3.

The reference C marks an impression-cylinder, which may be driven fromthe shaft 4 by gears a b c or in any other usual way. On this cylinderis fixed a closed (or other) cam 20 to operate the roller 22 on rod orlink 21, which rod is pivotallyconnected with the frame F, as by shaft9. The cam 2O is shaped to operate the rod and frame at the times thepinion 3 turns the ends of rack 2. This construction limits andregulates the motion of frame F. The pins 9 are not required in case thecam 2O is used.

The reciprocating motion of the bed T may be checked by any usual means.There is shown an air-cushion for this purpose. On the bed T is fixedthe two air-cylinders 23. These may be in the form of one tube oraircylinder having a central diaphragm or septum 24. On the framework ateach end are fixed the pistons 25 for coaction with the tubes orair-cylinders 23, which pistons are -or may be adjustable to causegreater or less cushionings and may be provided with suitable valves orsmall openings. As shown in the drawings, these pistons are guided bythe rods 26, which are fixed to the framing A and are moved by the rods27. These rods 27 have screw-threads 28 thereon, which engage likethreads in the sleeves 29, which are mounted to turn but not to slide inthe frame A. 'lhe sleeves 29 have pinions 30 thereon, which engage ormesh with the pinions 3l, sleeved on the rod 26 and in the frame A toturn but not to slide, and by which they are operated. Suitable handles32 are provided, whereby the pinions 31 are turned to operate the otherparts and move the pistons 25 on rods 26 to regulate the cushioningeffect. A suitable shield 33, attached at each end to the frame A, isplaced over the path of the air-cylinders 23 to prevent anything fromfalling across their mouths or on the pistons and so cause accidents. Ofcourse the positions of the pistons 25 and air-cylinders 23 maybereversed, in which case the latter becomes the adjustable element of theair-cushion device.

The bed-motion mechanism is as applicable to other machines whereinthere is a reciprocating member as in planers.

This invention is not limited to the precise form thereof hereinbeforedescribed and shown, for many changes in details and arrangement ofparts may be made Without departing from the spirit thereof.

Having thus fully described my invention, what l claim is- 1. Thecombination of a reciprocatory bed or member, a straight rack fastthereto, a swinging frame or member, a driving-pinion having the sameaxis of motion as said swing-4 ing frame or member, a rack-driving gearjournaled on said swinging frame or member and operatively connectedWith said drivingpinion, and mechanism for regulating the movement ofthe swinging frame or member as the rack-driving gear passes the ends ofthe rack, substantially as described.

2. The combination of a reciprocatory bed or member, a straight rackrigid and moving with said bed, a swinging frame or member, adriving-pinion having the same axis of motion as said frame, arack-driving gear fast on a shaft journaled in said frame, connectionsbetween said shaft and said drivingpinion, and mechanism for regulatingthe movement of the frame as the rack-driving gear passes the ends ofthe rack, substantially as described.

3. The combination of a reciprocatory bed or member, a swinging frame ormember, a driving-pinion having the same axis of motion as said frame, arack-driving gear journaled on said swinging frame or member and.operatively connected with said driving-pinion, a straight rack rigidand moving with said bed and with opposite sides of the teeth of whichsaid rack-driving gear is adapted to engage to move the bed in oppositedirections, and mechanism for regulating the movement of the swingingframe as the rackdriving gear passes around the ends of the rack,substantially as described.

IIO

4. The combination of a reciprocatory bed or member, a swinging frame ormember, a driving-pinion having the same axis of motion as said frame, arack-driving gear fast on a shaft journaled in said swingingl frame,connections between said shaft and said driving-pinion, a straight rackrigid and moving with said bed and with opposite sides of the teeth ofwhich said raekdriving gear is adapted to engage to move the bed inopposite directions, and mechanism for regulating the movement of saidswinging frame as the rack-driving gear passes around the ends of therack, substantially as` described.

5. In a printing-press, the combination of a reciprocatory bed, aprogressively rotating or revolving impression-cylinder, a rackconnected wi'th said bed, a drive-gear meshing with said rack,.aswinging frame on which said gear is journaled, adrive-pinion having thesaine axis of motion as said frame, gearing intermediate said pinion andsaid gear for driving the latter, a cam connected with said cylinder,and connection between said cam and said frame for moving or controllingthe frame as the driver-gear thereonA passes the ends of said rack,substantially as described.

6. The combination of a reciprocatory bed or member, a rack thereon, arack-driving gear, a movable frame for supporting said gear, adriver-pinion on the fixed framework of the machine, connections betweensaid driver-pinion and said rack-driving gear, a cam, and connectionsbetween the cam and movable frame for controlling the movement of themovable frame as the driving-gear passes the ends of the rack,substantially as described.

7. The combination of bed T, rack 2 thereon, pinion or gear 3 forcoaction with rack 2, pinion 5 fast on the shaft of gear 8, adrivepinion 7 on a shaft yin the fixed framework of the machine, a frameF pivoted on the same axis of motion as pinion 7, toothed gearingbetween pinion 7 and gear 5, a cam as 20, and connections as rod 21between the cam and the frame F, substantially as described.

8. The combination of a reeiprocatory bed or member, a rack thereon, arack-driving gear, a movable frame supporting said drivegear, adriver-pinion, connections between said driver-pinion and saiddriving-gear, a cam, and connections therefrom for controlling themovement of the fr'ame as the rackdriving gear passes the ends of therack, substantially as described.

Signed at New York, in the county of New York and State of New York,this 9th day of January, A. D. 1894.

WALTER SCOTT.

Witnesses:

R. W. BARKLEY, CHARLES A. BRODEK.

